The iOS 7 beta 4 download is now available for developers who have the revealed that the build features a number of improvements.

The fourth beta has brought bug fixes to the operating system, a designed lockscreen, Notification Center improvements, an updated look for Safari, and a slew of minor interface tweaks.

The Slide-to-Unlock feature has been updated with a shifting highlight color and an arrow that draws attention to the area on the lockscreen. The arrow is now illustrated using lines.

Mail can also be deleted quicker as swiping to erase them has been made to a new animation that gets rid of slight lag. The different sections in the Notification Center can be switched by swiping left or right along with a new one added for completed uploads. New AirPlay icons are also available on iOS 7.

Safari and Mail now have tweaked gradient designs, the fade animation for folders located in the dock has been updated to function properly, the call button takes up less of the phone's screen, messages now use the first name and last initial of a contact in the chat, and the search optioned normally accessed with a downward swipe on the screen features a "Cancel" option.

Safari now includes Buttons for Bookmarks, Shared Links, and the reading list has been redesigned with icons instead of labels.

iOS 7 4 beta also includes a new screenshot detection API that solves an issue preventing Snapchat from detecting screenshots.

iOS 7 was unveiled by Apple during this year's World Wide Developer's Conference which took place earlier this year. The new software is expected to roll out as an update for Apple devices sometime in the fall. It will be introduced on the next-generation iPhone models.